The idea of 10 dimensions might sound exciting, but they would cause real problems if you forget where you parked your car.

The universe does not behave according to our pre-conceived ideas. It continues to surprise us.

The rate of progress is so rapid that what one learns at school or university is always a bit out of date. Only a few people can keep up with the rapidly advancing frontier of knowledge, and they have to devote their whole time to it and specialize in a small area. The rest of the population has little idea of the advances that are being made or the excitement they are generating.

It often happens that I have an idea, but then I try to fill in the intermediate steps and find they don't work, so I have to give it up.

I'm a child myself, in the sense that I'm still looking. Children are fascinated by black holes and ask me questions. I find they soon get the idea if it is explained in nontechnical language.

There is no prescribed route to follow to arrive at a new idea. You have to make the intuitive leap.

No one can resist the idea of a crippled genius.

Many people do not like the idea that time has a beginning, probably because it smacks of divine intervention.

The idea that we are alone in the universe seems to me completely implausible and arrogant, considering the number of planets and stars that we know exist, it's extremely unlikely that we are the only form of evolved life.